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    xml:lang="en-US" lang="en-US">
    <head>
        <meta charset="UTF-8" />
        <title>Simplest Index</title>
    </head>

    <body>
        <h1>Title</h1>
        <section>
            <h2>Table of Contents</h2>
            <nav epub:type="toc">
                <ol>
                    <li><a href="#ch1">Chapter 1</a></li>
                    <li><a href="#ch2">Chapter 2</a></li>
                </ol>
            </nav>
        </section>
        <section id="ch1">
            <h2>Chapter 1</h2>
            <p>Lorem ipsum dolor sit amet.</p>
        </section>
        <section id="ch2">
            <h2>Chapter 2</h2>
            <p>Lorem ipsum dolor sit amet.</p>
        </section>
        <section>
            <h2>Simplest index</h2>
            <section>
                <h1>Group 1</h1>
                <ul>
                    <li><span>term 1</span>, <a href="#ch1">1</a></li>
                </ul>
            </section>
        </section>
    </body>
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